Feeding mechanism for sewing machines



A. H. DE VOE. FEEDING MECHANISM FOR SEWING MACHINES.

' APPLICATION FILED MAR. 6. I918- 1,435,454. I Patented Nov. 14, 1922.

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FEEDING MEC APPUCATION FILED MAR 6| I9I8.

Patented Nov. 14, 1922. 8 SHEETS-SHEET 2.

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ATTORNEY A. H. DE VDE. FEEDING MECHANISM FOR SEWING MACHINES. APPLICATION FILED MAR. 6. WM).

1,435,454, Patented Nov. '14, 1922.

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in est ALBERT DE VOE, OF WESTFIELID, NEW ERJSEY, ASSIGNOR TO SINGER MANU- FACTURING OOMPANY, A CORPORATION OF NEW JERSEY.

FEEDING IvIEGI-IANISM FOR SEWING MACHINES.

Application filed March 6, 1918. SerialNo. 220,720.

T all whom it may concern:

Be it known that I, ALBERT H. DE Von,

a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Feeding Mechanisms for Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawin s.

This-invention relates to multiple nee le sewing machines and particularly to feeding mechanism for such machines.

It is an object of this invention to provide new and improved feeding mechanism for 5 sewing machines of great power and durability.

It is a further object. of this invention to provide new and improved feeding mechanismcapable of advancing heavy fabric or other materials in a straight line anduniformly under at least two widely separated needles with work-engaging members having a very wide and broad surface for engaging the work. i y 1 It is a still further object of the invention toprovide a feeding mechanism in which the number of feed-dogs may be varied as desired and in which also the trains of mechanism for operating a common carrier for the several dogs may be multiplied as desired to suittheload imposed upon the feeding mechanism by the character of the contemplated work. i

In its preferred form the invention consists of a pair of separateand distinct feeddogs each having toothed sections andjoperated from separate and distinct actuating eccentrics on main-shaft located below the work-support through connectlons ineluding rigidly connected pairs of arms whose. free ends vibrate in short arcs which approximate straight lines at right angles The stitch-forming mechanism includes a plurality of needles 1', two being shown, widely spaced apart but it is to be understood that any, suitable spacing and number may be employed, secured by screws'2 111a socket in a cross-bar 3 carried by a needle-bar 4 braced as partially indicated at l. in a manner fullyv disclosed in my copending application Serial No. 230,399 filed April 24., 1918, and actuated in'any suitable manner. V

Cooperating with each of the needles is a. thread-carrying looper 5. having its blade portion disposed at an angleto thedirection of feed and secured by a screw 6 in a hole in a looper-carr-ier 7 actuated from an inclined crank embraced by a sleeve 8 in a manner fully shown and described in my prior Patent No. 1,256,880. granted;

February 19, 1918, so as tomove theloopers .endwise and sidewise in a manner well known to be desirable in the; formation of a double-thread chain-stitch. I

The foregoing description relates. to a construction which specifically forms no part of the present invention; H

The feeding mechanism in whichftheinvention of. this application particularly fresides will now .be described. I Each of a plurality of very wide feed-dogs. 9,-arranged abreast of each other in the direction the work advances, is secured by a screw 10 in a seat 11 of which there are two at the opposite ends of a common carrier 12 in the form of a U-shaped feed dog supporting bar hinged on a pin .13 loosely supported. in

the upper. end of arOeking frame 14: fulcrumed on a pin 15 secured by screws l6 (ofwhich only one is shown) in bearing lugs 17 rising. from the base-plate '18 constituting a portion of the frame of thema- .chine..,

.The'main shaft 19 of the machine 10 cated beneath the feed-dogs and carries an eccentric 2O forimparting lifting movements to the feed-dogs and an eccentric 21 forimparting feeding movements tothe feed-dogs.

The latter eccentric loosely fits around the shaft '19, and has a slidablyadjustableconnection with a collar 21 fixed on the shaft (Fig. 2). This, adjustment forms no part of thepresent invention and is fully dlsclosed in my prior Patent No.'1 ,14 8,446, ,dated July 27,1915 4 The mechanism for converting the throw of the adjustable eccentric 21 into feeding movements of the feeddogs will. now be described. Embracing the eccentric 21, which may be adjusted, is an eccentric-strap 22 having a sleeve 23 slidably receiving a pin 24 secured by screws 25 in the boss 26 of an L-shaped member, Fig. 6, having arms 27, 28 in the former of which is a socket 29 receiving the end of a counter-shaft 3O supported in bearings in the separated lugs 31 which are integral with the base-plate 18 of the machine and which are indicated grapht oally by the dotted lines in Fig. 5. At the opposite ends of the counter-shaft SO and disposed in parallelism are a pair of arms one, indicated by the numeral 28, before mentioned and the other indicated by the numeral 32, the last-named having; a split collar 33 clamped by the screws 34 to the counter-shaft 30. The arms 28 and 32 carry at their upper ends stud-screws 35 tapped into the free ends of arms SG'secured by screws 37 to the hinge-pin 18 which is loosely sustained by the rock-frame 14. By these duplicate trains of connections each of the plurality of feed-dogs 9 is moved back and forth to impart feed and return movements during the operation of the machine from a single actuating eccentric on the main-shaft.

Lifting movements are imparted to the feed-dogs from the eccentric 20 through connections similar to those which have been described. Embracing the eccentric 20 is a strap 40- having integral therewith a pin 41 extending into and slid-able in a socket in one leg of an approximately U-shaped rockin frame 42 fulcrumed also on the pin 15 beiore mentioned which supports the rocker 14. The shape of the rocking frame 42 is shown in Figs. 2 3 and 4. The legs 43 and 44 of the U-shaped rocking frame 42 are tapped to receive the shouldered stud-screws 45 and 46 by which they are connected through the links 47 and 48 to another pair of shouldered stud-screws 49 and 50 tapped into the feed-dogsupporting bar 12. By the foregoing described train of connections the throw of the lifi ing eccentric 20 is utilized to impart up and down movements to the feed-dog to initiate and determine the feed action. 7

It will be seen that the pin 15 forms a support or mounting for both ends of the feeddog supporting bar 12, through the rocking frame 14 and pin 13 on the one hand and the rocking frame 42 and links 47 and 48 on the other. By means of the connections previously described feed movements are transmitted from the main-shaft through the frame 14 and pin 13 tothe closed end of the bar 12-, and lift movements through the frame-42 andlinks 4:7'and 48 tothefree ends ofthebar. v 7

It will of course lie-understood that the separated needles; it will be apparent that eccentrics 20 and 21 secured on the mainshaft 19 are so disposed relative to each other that the components of motion imparted therefrom to the feed-dogs result in moving the feed-do-gs in a flat elliptical path. In a double-thread chain-stitch machine where it is desirable to give both endwise and sidewise movements to the loopers, it is highly desirable if not absolutely necessary to locate the looper-carrier and the feed-dog operating mechanism largely on opposite sides of a vertical plane containing the needles in order that the loopers may be operated as close as possible to the throatplate. In the previously described construction it will be seen that this desideratum has been realized in a multiple needle machine. In wide gauge sewing machine where at least two of the needles are spaced a wide distance apart it is necessary to feed at the same pace the opposite portions of the work which are simultaneously passing under the needles. In the type of machine which has been described, intended for handling heavy stiff material such as the tops of automobiles, it is necessary to provide a very wide feeddog in order to get a sufiicient grip onthe work to insure the equal advance of the portions of work passin under the most widely the present invention provides the wide feeddogs necessary and that the duplex operating mechanism connecting each of the feed-dogs with a single actuating element on the mainshaft renders the mechanism powerful in operation and durablein service.

l-la-vin thus set forth the nature of the invention, what I claim herein is 1. In a feeding mechanism for sewing machines, a plurality of separate feed-dogs, a main-shaft located beneath said feed-dogs, an: eccentric on said main-shaft, a rocker having a fixed fulcrum located in rear of the main-shaft, a plurality of arms on said rocker extending from said fixed fulcrum toward the mainshaft, substantially vertically arranged links connecting each of said feed-dogs with one of said arms, a sliding' connection between said main-shaft and said rocker whereby lifting movements of equal amplitude may be simultaneously imparted to" the feed-dogs, andmeans for imparting Ieeding movements to the feed-dogs.

2. In a feeding mechanism for sewing machines, a plurality of separate feeddogs, a I20 maiirshaft located beneath said feed-dogs, an eccentric on said main-shaft, a rocker having a fixed fulcrum located in rear of the main-shaft, a plurality of arms on said rocker extending from said fixed fulcrum toward the feed-dogs, substantially horizontally arranged links connecting said arms with said feed-dogs, a sliding connection between said maineshaft" and said rocker for imparting feeding movements of equal amplitude simultaneously to said feed-dogs, and means for imparting lifting movements to the feed-dogs.

3. In a feeding mechanism for sewing ma; chines, a plurality of feed-dogs, a mainshaft located beneath said feed-dogs, two pairs of rigidly connected arms fixedly ful crumed below the feed-dogs, pairs of angularly disposed links connecting said pairs of rigidly connected arms'with said feeddogs, separate actuating elements on said mainshaft, and sliding connections between each of said elements and each of said with the main-shaft including an eccentric and a feed-lift rocker having spaced arms each separately connected with a corresponding one of said feed-bar arms, and feed-advancing connections including a closed end, a plurality of feed-dogs sepa rately secured adjacent .thefree ends of the legs of the bar, a stationary pin secured in the machine frame, a rocking frame fulcrumed adjacent itslower side on said pin and pivoted adjacent its upper side to the pivot on the feed-dog supporting bar, a counter-shaft under the feed-dogs having arms secured thereto outside the legs of the feed-dog supporting bar, links connecting these arms with the opposite ends of the pivot pinbetween the feed-dog supporting bar and the rocking frame, a substantially U-shaped frame fulcrumed on the stationary pin and provided with spaced legs extending toward the feed-dogs, links pivoted to these legs and the legs of the feed-dog supporting bar, .a main-shaft and actuating means on said shaft for oscillating the counter sha'l't and rocking the U-shaped frame.

In testimony whereof, I have signed name to this specification. v

ALBERT DE VOE. 

